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might try removeing all 8 spark plugs and roll each piston to the top with valves close and sux it out with a shop vac.

might blow it out the plug hole with compressed air thru the hole as well.



You don't wanna use a shop vac to suck anything out, you'll just suck all that dust/dirt around the plugs right into your cylinders, law of physics there! Compressed air is the way to go!